Bending chisel head for a coil bending machine



1". WOLF BENDING CHISEL HEAD FOR A COIL BENDING MACHINE Filed Jan. 24, 1955 5 Sheets-Sheet 1 INVENTOR. 705w W04,

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BENDING CHISEL HEAD FOR A COIL BENDING MACHINE Filed Jan. 24, 1955 3 Sheets-Sheet 5 I IN VEN TOR. TUB/N WOL F BEND NGEHISEL HEAD, FOR A GOEL BENDING MAfiHiNE Tobin Wolf, Bloomfield, NJ. assignor to Westinghouse Electric Corporation, East Pittsburgh, Pin, a corporationof Pennsylvania Filed Jan. 24, 1955;, Sen-.No. 483,618 6 Claims. 140- 715) This invention relates to a coil bending machine, for projection lamp filaments. and, more particularly to a bending chisel head forsuch a machine.

A conventional filament for an incandescent electric lamp, such as a projection lamp, may be formed from a continuous coil into a monoplane or a bi-plane plural section filamentary device. The plural sections, ten for example of the bi-plane filament may comprise a first and last section for mounting legs, a second, third, eighth and ninth sectionsas outer sections and the remaining four sections as inner or center sections.

The purpose of this invention is to provide an improved bending chisel head for a coil bending machine for producing a bend in a continuously wound coil. Each bend is formed of one turn of the coil at a predetermined distance or number of turns from a desired point on the coil. The bending operation in the ten section example cited is performed nine times. at desired predetermined intervals. mentioned lamp filament are alternately staggered and shows a series of five loops on onesid'e and a series of four loops on the other side. The filament coil sections are arranged in a double vertical plane (bi-plane) so that the coils in the one row fill in the spaces between the sections of the other row. This arrangement produces greater uniformity and higher average brightness than the single row monoplane type filament.

A coil bending machine of the prior art is exemplified in US. Patent Number 2,693,204, filed May 29, 1952 by Arno Greiner et al., assigned to the assignee of the subject application and entitled Coil Bending Machine for Projection Lamp Filaments.

It has been found desirable to provide such an existing coil bendingmachine first, with mechanisms for accurately controlling or positioning the bending chisels and secondly to insure that each movement or positioning of the bending chisels in a required direction does not eiiect any other positioning requirement. It has been fonnd desirable aceording to the'inv'ention to accurately position the bending chisels in 'four directionsand to insure that all positioning movements will be independent.

It is desirable to accurately position and control the movement of the bending chiselswith respect to the continuous coil undergoing bending and the bending blade which is moved against two predetermined turns of a continuous coil. First, it is desirable to accurately rotate and position the screw driver like operating. end of the bending chisels so that said operating endis positioned at an angle corresponding to the helix angle of the continuous coil. Secondly, in order that the bending chisels will straddle one predetermined turn of the continuous coil (and not ,hit successive turns) it is also desirable to provide accurate positioning of the bending chisels in a directionparallel to the longitudinal axis of the unbent continuous e il. Thirdly, it is equally desirable to insertfthe operat ng ends oftthe bending chisel a predetermined aniount'into the barrel or body of the continuous coil. For this purpose the bending chisel All ten sections of the above .2 must be accurately positioned along its own longitudinal axis. Finally the total amount of bending of the. continuous coil is determined by the total are or angular swing through which the bending chisels are swung or rotated. The total arc of bending chisel travel must be accurately controlled to provide acceptable uniformly bent sections. 4

In its general aspect the present invention has as its objective an improved bending chisel head for a projection lamp coil bending machine.

An additional object is an improved bending chisel head in which the positioning of each bending chisel (firstly) longitudinally along its own axis (secondly) rotatably about its own axis and (thirdly) laterally with respect to each other and parallel to the longitudinal axis of the nnbent coil is achieved independently of each other and without disturbing each other.

A further object is an improved bending chisel head in which the swing of the bending chisels during the bending operation, can be accurately controlled and the final position of the chisels definitely limited.

A further object is an improved chisel head for a coil bending machine wherein each of the bending chisels may be positioned (independently of the other bending chisel) in a direction longitudinal of its own axis, rotatably about its own longitudinal axis, and laterally with respect to the other chisel and parallel to the longitudinal axis of the unbent coil A still further object is a bending chisel operating mechanism having independent control of the total are swing ofeach bending chisel.

Referring now to the drawings in which like numerals of reference indicate similar parts throughout the several views:

Fig. 1 is a plan elevational view of the improved bending chisel head of'the invention for aprojection lamp coil bending machine.

Fig. 2 is a side elevational view of the coil bending head of Fig. 1 along the line lI II of Fig. 1 in the direction of the arrows and showing more clearly the controlling and positioning mechanism for one bending chisel of said bending head. a

Fig. 3 is a vertical sectional view of the bending chisel head along the line IIIIII of Fig, 4 in the direction of the arrows and showing particularly the mechanism for controlling the longitudinal movement of a bending chisel along its longitudinal axis, the mechanism for rotating a bending chisel about its longitudinal axis and the mechanism for moving a bending chisel laterally with respect to the longitudinal axis of the unbent coil.

Fig. 4 is a vertical sectional view along the line IVIV of Fig. 3 in the direction of the arrows and showing particularly the bending chisel rotating mechanism.

Fig. 5 is a horizontal sectional view of the bending chisel head along the line VV of Fig. 2 in the direction of the arrows and showing more particularly the bending chisel swinging mechanism for controlling the total are of the bending chisels.

Fig. 6 is a horizontal sectional view of the bending chisel head along the line VIVI of Fig. 3 in the direction of the arrows and showing the meehan'sm for laterally positioning the bending chisels with respectto each other and parallel to the longitudinal axis of a continuous coil undergoing bending.

Fig. 7 is a plan diagrammatic view of the bending chisels, bending blade and continuous coil undergoing bending in the initial position after the insertion of the bending chisels astride a predetermined turn and showing diagrammatically the longitudinal movement of the bending chisels along their longitudinal axis and lateral movement of the bending chisels with respect to each other in a direction parallel to the longitudinal axis of the unbent coil.

Fig. 8 is a view similar to Fig. 7 and showing rotation of the chisels about their longitudinal axis and the total are swing of the bending chisels from the initial position of Fig. 7 to the final position shown therein.

Fig. 9 is a side elevational view of a projection lamp incorporating a filament formed into predetermined sections by the improved bending chisel head of the invention.

Referring to the drawings, and particularly to Fig. 9, the reference numeral 10 designates a projection lamp comprising a tubular envelope 12 provided with a base 14 and a mount 16. This mount 16 has a vitreous stem 18 which is sealed to the envelope 12 and is provided with leading-in and supporting conductors 20 and 22 and a support spud 24 projecting from a press thereof. In the present embodiment the normally free ends of these conductors 20 and 22 are bent at right angles for mounting thereon an outer support 25 of a fixed upper bridge 26. These supports 25 and a plurality of upper filament supports 28, 3 in the present showing of Fig. 9, depend from an insulator 30, suitably a piece of gass cane, of the upper bridge 26. The lower hooked ends of the supports 28 are in engagement with the top interconnecting loops of a filament 32. This filament 32 comprises eight coiled sections disposed in the usual manner in parallel vertical planes.

This filament 32 is provided with leg inserts 34 and 36 carrying coils thereon for threading onto legs of the filament 32. These inserts 34 and 36 are suitably bent for welding to the lead-in and supporting conductors 20 and 22 near their upper right angle bends.

A bottom floating bridge 37 is slidable on conductors 2t) and 22 by means of outer supports 38 which project from an insulator, suitably a piece of cane. Suitable filament supports 39 have their hooked upper ends inserted in the bottom loops of the filament 32. A bottom slide guide 39 projects from the insulator of the bridge 37 and is slidable on the spud 24.

Coil bending machine A coil bending machine 40 (Figs. 1 and 2) for projection lamp filaments 32 may have a frame as shown by parts 11 to 13 (Figs. 1 and 2), in U.S. Patent No. 2,693,204 consisting of a platform 44 (Fig. 2) and a base (not shown) integrated by suitable side plates and corner supports (also not shown). On this platform 44 may be mounted the improved coil bending head or bending chisel head 50 of the invention, an improved bending chisel operating (or swinging) mechanism 52 (Figs. 2 and 5), a bending blade 56 (Figs. 1, 2, 7 and 8), a bending blade advancing and retracting mechanism as shown in parts 50 to 70 (Fig. l) in U.S. Patent No. 2,693,204 and a coil stop and locator mechanism as shown in parts 90 to 120 (Fig. 2) in U.S. Patent No. 2,693,204.

Bending chisel head 5 A pair of hinged elements 60 and 62, Figs. 1, 2, 3, and 6 particularly, of the bending chisel head 50, swing about a center hinge post 64. This post 64 in turn is mounted on a suitable bracket 66 (Fig. 2) upstanding from the platform 44 and suitably insulated therefrom. Each of the hinged elements 60 and 62 may be a casting having thick doughnut like registering washers (separated by the thickness of a washer) and integrated by a vertical member or plate. Each of these plates of the elements 60 and 62 has an upper portion or bending chisel mounting block 68 and 70 respectively (Figs. 1, 2, 3 and 6), which extends parallel to the axis of a continuous coil 71 (Figs. 7 and 8). These mounting blocks 68'and 70 respectively (according to the invention as hereinafter explained) carry bending chisels 72 and 74 respectively. The chisels 72 and 74 are mounted in normally angular spaced relation to each other, according to the pitch of a continuous coil 71 (Figs. 7 and 8) for insertion of a predetermined turn of a continuous coil 71 therebetween.

In the operation of the coil bending machine the operator holds the coil 71 on the center post 64 and positions one end thereof in the coil stop and locator which is movable in the position on the center post to locate a predetermined turn adjacent the bending chisels 72 and 74.

The bending blade 56, shown fragmentary in Figs. 1 and 2, may be mounted in a bending blade holder (not shown) as explained in greater detail in the hereinbefore mentioned U.S. Patent Number 2,693,204. This bending blade 56 is moved by the advancing and detracting mechanism against the continuous coil 71 (Fig. 7 to partially insert the predetermined turn between the chisels 72 and 74 and permit retraction of the coil stop and locator. A suitable line (not shown) connects the bending blade 56 to one side of a power supply (not shown) for resistive heating of the section of the coil 71 to be bent.

The bending blade 56 is then fully inserted into the blade receiving space in the coil 71 to secure the predetermined turn between the bending chisels 72 and 74, whereupon the chisels are rotated by the operating mechanism laterally in opposite directions from a position similar to Fig. 7 to the position shown in Fig. 8 to form the desired bend in the coil. The bending chisels 72 and 74 are then retracted to their starting position (Fig. 7) leaving the bent coil on the bending blade 56 which retracts with the coil 71 carried thereby to its starting position indicated in Figs. 1 and 2. The operator then removes the bent coil from the bending b'ade 56 and positions the first bent section of the coil in the coil stop and locator which has been advanced preparatory for the next bending operation.

The coil bending head 50 of the invention has a bending chisel lateral positioning mechanism, a bending chisel rotating mechanism and a bending chisel reciprocating mechanism (Figs. 1 through 4 and 6) for each bending chisel 72 and 74. A bending arc control mechanism for the bending chisel operating mechanism 52 on the platform 44 controls and limits the total arc swing of the bending chisels 72 and 74. Each of the hinged elements 60 and 62 of the coil bending head 50 carries a radial extension or lug 88 (Figs. 2 and 5) which is pivotably connected to the arc control mechanism as hereinafter explained.

Bending chisel lateral positioning mechanism As shown particularly in Figs. 1, 2 and 3 each of the mounting blocks 68 and 70 is provided with a lateral V- shaped slide guide 90 extending substantially parallel to the continuous unbent coil 71. A slide 92 is held in each of the slide guides 90 by means of a mounting bolt 94 (Figs. 1, 3 and 6) extending through a transverse positioning slot 96 (Fig 6 particularly) in the blocks 68 and 70, and threadable into the V-like nose of the slide 92. It will be understood that the head of each of the bolts 94 is rotatable in an enlarged portion of its positioning slot 96. A single turn spring 98 (Fig. 6), such as a lockwasher, may be employed on each bolt 94 between the head of the bolt 94 and the inner portion of each of the blocks 68 and 70 so that when the bolt 94 is loosened to position the chisels 72 and 74 laterally, as hereinafter explained, the spring 98 still maintains the V-like nose of the slide 92 in the guide 90 of the blocks 68 and 70.

Each of the mounting blocks 68 and 70 (Figs. 1 and 6) carries a positioning bolt support arm or cap 100 secured thereto, as by a bolt. A lateral positioning bolt 102 threadable in each of the arms 100 (one bolt 102 for one arm 100) has a flange or slide engaging portion of reduced diameter. The flange engaging portion may be inserted laterally into a U-shaped slot in a flange or right angled lug 104 (Fig. 6) on the slide 92, so that the bolt 102 and each of the blocks 68 and 70 move laterally together in a direction parallel to a continuous unbent coil 71 to laterally space the operating end of the bending glgisels from the longitudinal axis of the coil bending head It will be understood that each of the bending chisel lateral positioning mechanism may be assembled by inserting the slide engaging portion of the lateral positioning bolt 102 into the slot in the flange 104. Each of the mounting bolts 94 is extended through the clearance slot 96 and threaded into the slide 92 until said slide 92 is securely engaged in the guide slide 90 of, for example, the mounting block 68. The arm 100 is threaded over the threaded end of the lateral positioning bolt 102 and then secured in place on the end portions of the mounting block 68, as by means of a bolt (Fig. 6).

It will be understood that the lateral positioning bolt 102may be provided with, for example, 100 threads to the inch. For each complete turn of the bolt 102 the flange 104 and hence the inner slide 92 (when viewed in Fig. 1) is moved either inwardly or outwardly .01" depending on whether clockwise or counterclockwise rotation respectively of the bolt 102 is employed.

Each of the slides 92 has an angular mounting projection106 (Figs. 1, 4 and 6) of suitable L-shaped vertical cross section (Fig. 4) for carrying thereon, as by bolts 108 (Fig. 6) a bending chisel spindle holder or body 110 (Figs. 1, 2, 3, 4 and 6).

Bending chisel spindle holders Each of these bending chisel spindle holders or bodies 110 (Figs. 3 and 4) is a generally vertical plate having a spindle mounting hole 112. An axial slot 114 extends from the spindle hole 112 to the bottom face of the body 110 to suitably bifurcate the lower portion of the body 110. A spindle locking bolt 116 extends through the L-shaped mounting portion 106 of the slide 92 and the adjacent bifurcation in the body 110 and threads into the opposite bifurcation so that a bending chisel spindle 120 (Figs. 2, 3 and 4) may be secured therein.

This bending chisel spindle 120 is provided, as shown particularly in Figs. 1, 2, 3 and 4, with a keying flange 122 for use with the bending chisel reciprocating mechanism, as hereinafter explained. It will be understood that the left hand end'of the spindle 120 may be suitably quadrented by radial slits. A vernier 124 (Figs. 1, 2, 3 and 4) of the bending chisel rotating mechanism may be secured about the left hand split end of the spindle 120 by means of its split collar lower portion 126 and a vernier mounting bolt 128 (Fig. 3), to secure therein, for example, the bending chisel 72. Both of the bending chiscls 72 and 74 carry an electrical terminal 130 (on the left hand end when viewed in Figs. 1, 2 and 3) for connection to the other side of the hereinbefore mentioned power supply and resistively heating the one turn of the continuous coil 71 undergoing bending.

Bending chisel rotating (or 'angular positioning) mechanism In addition to the vernier 124, each of the bending chisel rotating (or angular positioning) mechanisms has a pinion shaft 132 extending through the vernier 124 (Figs. 3 and 4). This pinion shaft 132 carries a knurled knob 134 (Figs. 1, 2 and 3) on the left hand end when viewed in Fig. 3 and a pinion gear 136 (Fig. 4) on the right hand end thereof. This gear 136 engages a gear segment 138. secured, as by bolts, to a stationary segmental calibrated scale 142 (Figs. 1-4). This scale142 carries an L-shaped key 144 (Fig. 3) on its lower end, secured thereby as by brazing. This key 144 is slidable in a longitudinal'slot 146 (Fig. 4) provided in the upper face of the bending chisel spindle holder or body 110. In addition, the keying flange 122 on the spindle 120 is engageable in a slot 148 (Fig. 3) in the key 144 so that the spindle.120,,the key 144, the scale 142 and the vernier 124 and hence a bending chisel 72, for example, all move longitudinally with respect to the body 110, as hereinafter explained.- I V v g It will beunderstood that the vernier 124 and the spindle and hence the bending chisels, either 72 and 74, will rotate together as a unit. By turning the knurled knob 134 in a clockwise direction, when viewed in Fig. 4, the vernier 124 and hence the bending chisel 72 (for example) is moved in a counterclockwise direction. Conversely by turning the knob 134 in a counterclockwise direction (when viewed in Fig. 4) the pinion gear 136 moves in a clockwise direction on the stationary gear segment 138. Hence, the vernier 124 and the bending chisel 72 moves in a counterclockwise direction. Thus, any desired position of the operating end of, either or both, the bending chisels 72 and 74 may be achieved accurately and easily without disturbing the lateral arrangement of the bending chisels 72 and 74 or the longitudinal position of the chisels 72 and 74 with respect to the body 110.

To assemble the rotary positioning or rotating mechanism, the assembled vernier 124 and calibrated scale 142 are mounted on the spindle 120 (so that the spindle flange 122 engages the slot 148 in the key 144 on the scale 142) by means of the split collar lower portion 126 and the mounting bolt 128. The key 144 on the scale 142 and the spindle 120 are inserted respectively into the slot 146 in the spindle body 110 and the spindle mounting hole 112 in the spindle body 110.

Bendingchisel reciprocating mechanism As shown in Figs. 1, 2, 3 and 4, the bending chisel spindle holder or body 110 carries a longitudinal or radial positioning bracket 150 on its upper surface, secured there on, as by bolts 152 extending through flanged portions thereof. The upstanding lug-like portion of the bracket 150 is in threadable engagement with a bending chisel radially reciprocating or longitudinally positioning bolt 154 of the bending chisel reciprocating mechanism. This reciprocating bolt 154, like the lateral adjustment screw 102, has a key-engaging portion of reduceddiameter on its left hand end, when viewed in Fig. 3, for. insertion into the enlarged upper portion of, and for engagement with the lower'reduced portion of, a key-hole like key 158 (Fig. 4) provided in the scale 142.

Thus, when the radially reciprocating or longitudinal positioning bolt 154 is turned in a clockwise direction, when viewed in Fig. 4, the scale 142 and the key 144 are moved backwardly from the body 110 or to the left when considered in Fig. 3. This movement of the key 144' of course moves the spindle 112 and hence the bending chisel 72, for example, in the same direction therewith.

It will be understood that the reciprocating bolt 154, like the lateral'positioning bolt 192, may be provided with 100 threads to the inch. Thus each complete turn of the bolt 154 moves the bending chisel 72, for example .01" along its longitudinal or radial axis.

Each of the longitudinal positioning or reciprocating mechanisms 84 may be assembled easily by threading the bolt 154 through the bracket 155, inserting the key engaging end thereof into the key 158, and bolting the bracket 150 to the spindle body 110.

Bending chisel operating mechanism The bending chisel operating or swinging mechanism 52, except as hereinafter described is essentially the same as the bending chisel operating mechanism disclosed in the before-mentioned U.S. Patent No. 2,693,204. This bending chisel operating mechanism 52 as shown particularly in Figs. 1,2 and 5 has a slide guide 179 (essentially a pair of tapered guide rails), mounted by means of a bracket 172 (only one of which is shown in Fig; 2) on the platform 44 of the coil bending machine 10.

Bendingarc control mechanism Thebending arc controlmechanisnt has a lower slide plate 174 (Figs. 2 and 5) for engagement with the slide 7 guide 170 and an upper insulating block 175 for carrying thereon an overhanging collar bracket or plate 176. Slide retaining plates 178 (Figs. 1, 2 and maintain the lower slide 174 in contact with slide guide 170. As shown in Figs. 1 and 2, the collar bracket 176, insulating block 175 and lower slide,174 are integrated by a pair of bolts 180 which are insulated from the collar bracket 176 by suitable bushings.

This collar bracket 176 extends beyond the insulating block 175 (overhanging the rails 170) and carries on each of the opposite projecting ends thereof a generally hollow plunger body 182 (Figs. 1, 2 and 5) which is pivotably secured thereon, as by means of a shoulder bolt 184. Each of the plunger bodies 182 is provided with longitudinal registering plunger pin slots 186 (Figs. 2 and 5) for use as hereinafter explained. Each of the plunger bodies 182 carries a round plunger 188 provided with a plunger pin 190, handily for engagement with the plunger pin slots 186. From a consideration of Figs. 2 and 5, it will be understood that each of the plungers 188 extends beyond its respective body 182 and has its normally free end pivotably secured, as by means of a shoulder bolt 192, to one of the projections 88 on the hinged elements 60 and 62. A compression spring 194 on the plunger 188 extends from the end of the plunger barrel 182 to a shoulder on the plunger 188 adjacent to the bolt 192.

As shown in Figs. 1, 2 and 5 an upstanding hinged element stop bracket 200 may be mounted (on either side of the coil bending head 50 and generally in parallel alignment with the plunger bodies 182) by means of its lower flanged portion to the platform 44, as by welding. Each of these hinged element stop brackets 200 may be provided with an adjustable hinged element stop 202 (Figs. 1, 2 and 5), suitably a threaded bolt having, for example 100 threads to the inch and provided with a lock nut 204.

It will be understood that the slide 174 is reciprocated back and forth on the slide guide 170 by means (not shown) such as the bending chisel operating cam mech anism described in the hereinbefore mentioned U.S. Patent No. 2,693,204.

As shown in Fig. 5, the maximum reciprocating travel of the slide bracket 176 may be set and held constant, for example, the distance AA (Fig. 5). Hence, the maximum rotation of the hinged element 62 for example is through a clockwise arc BB (Fig. 5). However, the upper hinged element stop 202 may be independently moved to the left when viewed in Fig. 5, to reduce the rotation of, for example, the hinged element 62 to an angle less than the maximum angle BB shown in Fig. 5.

Thus, when the projection 88 on the hinged elements 62 strikes the hinged element stop 282, the hinged element 62 ceases to rotate. The plunger body 182 continues to move to the right when viewed in Figs. 2 and 5, compressing the spring 194 and causing the plunger pin 190 to move toward the left hand end (when viewed in Fig. 5) of the plunger pin slot 186.

Thus, it will be seen from the foregoing description that the present invention has provided an improved bending chisel head 50 for the projection lamp coil bending machine 10. The improved bending chisel head 58 for a projection lamp filament 32 has a bending chisel rotating mechanism (bending chisel rotary positioning mechanism) for rotating the bending chisels 72 and 74 about their longitudinal axes, a bending chisel reciprocating mechanism (bending chisel longitudinal or radial positioning mechanism) for moving the chisels 72 and 74 along their longtiudinal axes and a bending chisel lateral positioning mechanism for positioning the bending chisels 72 and 74 with respect to each other and the longitudinal axis of the continuous unbent coil 71. The invention also provides a bending arc control mechanism for the bending chisel operating mechanism 52 which limits and controls the final position of the bending chisels 72 and 74.

The improved bending chisel head 50 is capable of positioning each bending chisel, for example 72, longi- 8 tudinally or radially with respect to its own longitudinal axis, rotatably about its own longitudinal axis and laterally with respect to other bending chisel 74 and parallel to the longitudinal axis of the unbent coil 71 but independently of the other bending chisel 74. Similarly, the total are swing of the bending chisels 72 and 74 is accurately and independently controlled by the bending arc control mechanism.

Although a preferred embodiment of the invention has been disclosed it will be understood that modifications may be made within the spirit and scope of the invention.

I claim:

1. In a machine for bending a continuous coil into a multi-section lamp filament, an improved bending chisel assembly having support means pivotably mounted to oscillate about an axis, mounting means slidable in said support means, a bending chisel secured on said mounting means, means on said support means connected to said mounting means and operable to laterally position an operating end of said bending chisel with respect to the axis of said support means, means operatively connected to said bending chisel and operable to cause movement of said bending chisel along its longitudinal axis to radially position the operating end of said bending chisel with respect to the axis of said support means, means operatively associated with said bending chisel and operable to cause rotary movement of said bending chisel about its longitudinal axis to position the operating end of said bending chisel at a desired angle with respect to the axis of said support means, and means connected to said support means for causing oscillating movement of the latter.

2. In a machine for bending a continuous coil into a multi-section lamp filament, an improved bending chisel assembly having support means pivotably mounted to oscillate about an axis, mounting means slidable in said support means, a bending chisel secured on said mounting means, means on said support means connected to said mounting means and operable to laterally position an operating end of said bending chisel with respect to the axis of said support means, means operatively connected to said bending chisel and operable to cause movement of said bending chisel along its longitudinal axis to radially position the operating end of said bending chisel with respect to the axis of said support means, means operatively associated with said bending chisel and operable to cause rotary movement of said bending chisel about its longitudinal axis to position the operating end of said bending chisel at a desired angle with respect to the axis of said support means, means connected to said support means for causing oscillating movement of the latter, and stop means disposed adjacent the path of movement of said support means and operable to limit and control its path of movement.

3. In a machine for bending a continuous coil into a multi-section lamp filament, an improved bending chisel assembly having support means pivotably mounted to oscillate about an axis, mounting means slidable in said support means, a bending chisel secured on said mounting means, a member in threaded engagement with said support means and connected to said mounting means, said member being operable to laterally position an operating end of said bending chisel with respect to the axis of said support means, means operatively connected to Said bending chisel and operable to cause movement of said bending chisel along its longitudinal axis to radially position the operating end of said bending chisel with respect to said support means, means operatively associated with said bending chisel and operable to cause rotary movement of said bending chisel about its longitudinal axis to position the operating end of said bending chisel at a desired angle with respect to the axis of said support means, and means connected to said support means for causing oscillating movement of the latter.

4. In a machine for bending a continuous coil into a 'multi-section lamp filament, an improved bending chisel assembly having support means pivotably mounted to oscillate an axis, mounting means slidable in said support means, a bending chisel secured on said mounting means, means on said support means connected to said mounting means and operable to laterally position an operating end of said bending chisel with respect to the axis of said support means, a slide connected to said bending chisel and movable in said mounting means, a member in threaded engagement With said mounting means and connected to said slide, said member being operable to cause movement of said slide and said bending chisel along their longitudinal axis to radially position the operating end of said bending chisel with respect to said axis, means operatively connected to said bending chisel and operable to cause movement of said bending chisel along its longitudinal axis to radially position the operating end of said bending chisel with respect to the axis of said support means, means operatively associated With said bending chisel and operable to cause rotary movement of said bending chisel about its longitudinal axis to position the operating end of said bending chisel at a desired angle with respect to the axis of said support means, and means connected to said support means for causing oscillating movement of the latter.

5. In a machine for bending a continuous coil into a multi-section lamp filament, an improved bending chisel assembly having support means pivotably mounted to oscillate about an axis, mounting means slidable in said support means, a bending chisel secured on said mounting means, means on said support means connected to said mounting means and operable to laterally position an operating end of said bending chisel with respect to the axis of said support means, a slide connected to said bending chisel and movable in said mounting means, a gear segment on said slide, a member in threaded engagement with said mounting means and connected to said slide, said member being operable to cause movement of said slide and said bending chisel along their longitudinal axis to radially position the operating end of said bending chisel with respect to said axis, shaft supporting means connected to said bending chisel, a shaft extending through said shaft supporting means, a gear on said shaft engageable with said gear segment to cause rotary movement of said shaft supporting means and said bending chisel about the longitudinal axis of the latter to position the operating end of said bending chisel at a desired angle with respect to said axis, and means connected to said support means for causing oscillating movement of the latter.

6. In a machine for bending a continuous coil into a multi-section lamp filament, an improved bending chisel assembly having support means pivotably mounted to oscillate about an axis, mounting means slidable in said support means, a bending chisel secured on said mounting means, means on said support means connected to said mounting means and operable to laterally position an operating end of said bending chisel With respect to the axis of said support means, means operatively connected to said bending chisel and operable to cause movement of said bending chisel along its longitudinal axis to radially position the operating end of said bending chisel with respect to said support means, means operatively associated with said bending chisel and operable to cause rotary movement of said bending chisel about its longitudinal axis to position the operating end of said bending chisel at a desired angle with respect to the axis of said support means, a slide disposed adjacent said support means, means of the lost-motion type pivoted on said slide and to said support means, stop means disposed in the path of movement of said support means to limit and control its path of movement, and means connected to said slide and operable to reciprocate the latter to thereby cause swinging movement of said support means about its axis.

References Cited in the file of this patent UNITED STATES PATENTS 1,889,239 Crowley Nov, 29, 1932 2,624,377 Smith Jan. 6, 1953 2,686,539 Greiner Aug. 17, 1954 2,693,204 Greiner Nov. 2, 1954 

